Grinding-mill.



A. RUHLAND.

. GRINDING MILL.

APPLICATION FILED NOV. 9, 190B.

916,786. Patented Mar. 30, 1909.

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{J a? ii WITNESSES I TTOHHEY.

. UNITED STATES PATENT OFFICE.

ADOLPH RUHLAND, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CHARLES E. TROEMNER, OF PHILADELPHIA, PENNSYLVANIA.

GRINDING-MILL.

Specification of Letters Patent.

Patented March so, 1909.

Application filed November 9, 1908. Serial No. 461,623.

ToaZZ whom it may concern.

Be it known that I, AnoLPH RUHLAND, a citizen of the-United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

My invention relates to means operating to automatically release the grinding means of a cofiee or other mill when foreign matter as nails,,sticks or the like, contact with the working faces of the fixed and movable members of such grinding means of the mill, interfering with uniform workings'thereof.

' The nature, scope and characteristic fea tures of my invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof, in whicl Figure 1, is a vertical longitudinal section of a power operated coffee or similar mill having a driven shaft and means for automatically disengaging the grinding means of the mill when matter, foreign to that to be ground contacts with the working faces of thesaid means, the said means embodying as to particular constructive arrangement, main features of my present invent-ion. Fig. 2, is a vertical sectional view on the line 00, (1?, of Fig. l of the automatic disengaging means in inoperative position, as far as afi'ecting the grinding-means of the mill and Fig. 3, is a similar view of the automatic disengaging means in operative position for affecting the said grinding means, but with the casing removed and the spring finger shown released from its stop to permit only the driven shaft of the mill to revolve and the movable member of the grinding means of themillto become inoperative so far as the grinding of matter by the fixed and movable members thereof. v

Referring to the drawings 3 and 3*, represent sectional casings housing working parts of an ordinary power operated coffee mill.

4, is the feed hopper provided therein with a slide a. The hopper 4, merges into a chamber 5, in which is placed grinding means 6. This means consists of two toothed disks 1) and c, facing each other as shown in Fig. '1. One of the tooth disks 6, of the grinding means is fixed to the casing 3, by

,means of bolts or other fastening means (I, while the other disk 0, is detachably mountthe inclined and straight walls of the main grinding chamber 5, and extending downward therefrom, is an outlet throat 7.

8,'is a driven shaft adapted to be operated from an electric or other motor, not shown. The shaft 8, is splined at S to a sleeve 9. Atone end bears against a coiled spring 10, mounted in the said sleeve. The sleeve.9, is offset at 11, and divided into a circular extension 13, to form a bearing in the removable casing The end of the bearing eirtension l3,' is recessed to forin a flanged end l-t, and around the offset portion 15, of which are arranged balls 16, held to place by means of a recessed gasket 17, as clearly illustrated in Fig. 1.

18, is a jamn'ut arranged to engage the flanged end of the bearing 13, to tighten the bearing 13, and also the sleeve 9, on the shaft 8, under the tension of the spring 10, to reduce friction to a minimum in operation of the said parts as illustrated in Fig. 1.

19 and 20, are lubricating devices for the sleeve 9, and shaft 8. These devices by feed pipes 19 and 20*, extend downward through the casings 3 and 3, to keep by periodic supply of the lubricant, the shaft 8, splined to the sleeve 9, with its ball bearings 16,'in good working condition.

21, is a spring tension pin arranged to enter one of a series of openings intended to be provided on the inner side of the head of the jam-nut 18.

22, is a ring secured by means of screws 28, to the cup-shaped end 23, of an outer sleeve 23, mounted on the inner sleeve 9, of the shaft 8, and bearing against the wall 0, of the grinding-means 6. Projecting from the ring 22, is a post 24,'having a fiat curved spring-finger 25, Figs. 2 and 3, arrangedto embrace at one end the post 24, and at the other end formed into a curved lip 26, so as to bear against the post 27, projecting from the flanged end 11, of the sleeve 9, to revolve with the shaft 8, under regulation of the tension pin 28, passing through the extension 13, of the sleeve 9, as fully illustrated in Figs. 2 and 3. The position'of the spring finger 25, in Fig. 2, being that it occupies during the ordinary grinding of coffee or the like in the mill but when foreign matter is brought into contact with the toothed disks 6 and c, of the said grinding means 6-, of the mill the spring finger ed on the rotary member of the mill. From 25, automatically releases itself from engagement with the post 27, and assumes the position as shown in Fig. 3, to enable the movable member a, of the grinding-means 6, to become inoperative with respect to fixed member I), to prevent breaking the teeth of the respective disks of the said grinding means.

When foreign matter is carried into the grinding means 6, with the cofiee grains or the like at. once the undue friction brought to bear against the surfaces 6 and 0, of the said. grinding means 6, causes the inner sleeve 9, with the shaft 8, splined thereto to turn and thus force the spring finger 25,

automatically away from the post 27, so as to occupy the position as shown in Fig. 3, and therewith the toothed disk 0, 01 the grinding-means 6, to become inoperative and only the driving means for instance the sleeve 9 and disk 11, to revolve as will be clearly understood from Fig. 1, By stopits ordinary grinding operations. The tension of the spring-finger 25, against the post 27, can at, all times be readily controlled by means of the threaded pin 28, as shown in Figs. 2 and 3.

! Having thus described the nature and oband'desire to secure by Letters Patent is 1. In a grinding mill, means to automatically disengage grinding means of such mill, consisting of driving means, a sleeve, a movable member of said grinding means mounted on said sleeve, a post connected secured to said sleeve and normally contacting with said post, substantially as and for the purposes described.

ically disengage the grinding-means of such scribed.

In witness whereof, I have hereunto set my signature in the presence of two subscribing witnesses.

ADOLPH RUHLAND.

Witnesses J. WALTER DOUGLASS, THOMAS M. SMITH.

2. In a grinding mill, means to automat- 1 mill, compris ng a driving means, a sleeve,-

substantially as and for the purposes deject of my invention, whatI claim as new with said driving means and a spring finger 

